Does polycarbonate block all harmful UV?

Question

I have UV lights that I would like to put in a tube and block it's harmful UV rays. I plan to use a polycarbonate tube, but I'm getting conflicting answers on wikipedia if it 100% blocks harmful UV.

http://en.wikipedia.org/wiki/Polycarbonate
Above link it says polycarb resists UV fairly. (right and colum in yellow)
On the same page bellow the graph it says: 0% transmission at almost exactly 400 nm, blocking all UV light transmission."

Then here:
http://en.wikipedia.org/wiki/UV_light

It says under "Eye" paragraph. "Some plastic lens materials, such as polycarbonate, inherently block most UV."

What's the straight story on this?

Answer 1

It may depend on how thick the polycarbonate is. It will certainly depend on the wavelength that the lamp emits.

But what is the point of setting up a UV lamp if you don't want the UV?

Answer 2

The straight story is that there is absolutely no need to block "harmful" UV emissions from a UV tube. Just don't use the tube because ALL UV is harmful. Without a spectrometer and a sample of the actual material OR at least a manufacturer's data sheet addressing optical properties of the material in the near UV nobody can answer your question reliably, anyway. Straight enough?